CN106817226B

CN106817226B - A kind of method of supplying power to and PSE based on PoE

Info

Publication number: CN106817226B
Application number: CN201510863963.9A
Authority: CN
Inventors: 杨传枫
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-11-30
Filing date: 2015-11-30
Publication date: 2019-11-29
Anticipated expiration: 2035-11-30
Also published as: CA2949613A1; CA2949613C; US10027494B2; EP3174243B1; JP2017103768A; CN106817226A; US20170155518A1; JP6379162B2; EP3174243A1

Abstract

The invention discloses a kind of method of supplying power to and PSE based on PoE, this method comprises: after PSE powers to PD, the PSE determines the line drop of the cable between the PSE and the PD, when the line drop of the cable is greater than line drop threshold value, the PSE sends the first ether network packet to the PD, reduce the PD by the instruction information of load power consumption according to the instruction PD for including in the first ether network packet, reduce the load of itself, guarantee that voltage that the PD is received can satisfy the power supply requirement of own load, and then guarantee that the PD can work normally.

Description

A kind of method of supplying power to and PSE based on PoE

Technical field

The present invention relates to field of communication technology more particularly to a kind of method of supplying power to and PSE based on PoE.

Background technique

Power over Ethernet (Power over Ethernet, abbreviation PoE) technology refers to that by Ethernet be terminal power supply, Can efficiently solve Internet protocol (Internet Protocol, abbreviation IP) phone, portable equipment charger, the POS, The powerup issue of the terminals such as camera, data collector.For these terminals, it is no longer necessary to consider power-supply system wiring Problem can realize the power supply to equipment while accessing network.Include power supply end equipment (Power in PoE system Sourcing Equipment, abbreviation PSE) and receiving end equipment (Powered Device, abbreviation PD), PSE be used for PD into Row power supply.

With PoE technology development and standard it is perfect, support the device category of remote power feeding more and more abundant, and every The load of a equipment is not quite similar.However, in PoE relevant criterion, what the output voltage of PSE was usually fixed, for example, 53.5 Volt (English: volt, symbol: V), and cause line drop excessive when cable is longer or transimission power is larger between PSE and PD When, the voltage that PD is received is unable to satisfy requirement, and then influences the normal work of PD.

Summary of the invention

The application provides a kind of method of supplying power to and PSE based on PoE, to solve PSE output voltage be fixed value In the case where, since the line drop of cable between the PSE and PD is excessive, the voltage for causing the PD to receive, which is unable to satisfy, to be wanted The problem of asking, and then influencing the normal work of PD.

In a first aspect, providing a kind of method of supplying power to based on Power over Ethernet PoE, comprising:

After the end equipment PSE that powers powers to receiving end equipment PD, the PSE determines the cable between the PSE and PD Line drop；

When the line drop of the cable is greater than line drop threshold value, the PSE sends the first Ethernet to the PD Message includes indicating that the PD reduces the instruction information of load power consumption in the first ether network packet.

Using the above method, when the line drop of the cable between PSE and PD is greater than line drop threshold value, the PSE Power control administration is carried out to the PD, reduces the PD by load power consumption, in this way, the PD reduces own load, demand The numerical value of voltage reduces, and the voltage for providing the PSE to the PD can satisfy the power supply requirement of the PD, guarantee the PD It works normally, power-down conditions does not occur.

With reference to first aspect, in the first possible implementation, the PSE determines the line drop of the cable, Include:

The PSE determines the impedance of the cable before powering to the PD；The PSE is powering it to the PD Afterwards, the electric current in the cable is determined；And by the product of the impedance of electric current and the cable in the cable, as the net The line drop of line；Or

The PSE detects the voltage at the both ends of the PD, and the output voltage that the PSE is exported to the PD with it is described The difference in voltage at the both ends PD, the line drop as the cable；Or

The PSE determines the output power of the PSE, the load power consumption of the PD and the electric current in the cable, will The quotient of the difference of the load power consumption of the output power of the PSE and the PD and the electric current, the line drop as the cable.

The possible implementation of with reference to first aspect the first, in second of possible implementation of first aspect In, the PSE determines the impedance of the cable, comprising:

The PSE determines the length of the cable, and determines the cable type of the cable；

The PSE determines the corresponding unit length impedance of the cable type according to the cable type；And

Impedance by the product of the unit length impedance and the length of the cable, as the cable；

Wherein, the PSE determines the cable type of the cable, comprising:

The Signal to Noise Ratio (SNR) of PSE detection cable under multiple output powers, and determine the output work of the cable First corresponding relationship of rate and SNR；

The PSE is according to the output power of various cable types and the corresponding relationship of SNR and the first corresponding pass System, determines the cable type of the cable.

With reference to first aspect, first aspect the first, any one of second of possible implementation, in first aspect The third possible implementation in, the method also includes:

The PSE sends first voltage pulse to the PD, and detects the second voltage pulse that the PD is received；

The PSE determines that the cable of the cable is inserted according to the first voltage pulse and the second voltage pulse Damage；

The PSE determines the corresponding cable temperature of the cable Insertion Loss of the cable according to the corresponding relationship of Insertion Loss and temperature；

When the PSE determine the cable temperature be greater than cable temperature threshold when, the PSE to the PD send second with Too network packet includes indicating that the PD reduces the instruction information of load power consumption in the second ether network packet.

Using the above method, the PSE can also carry out implementing monitoring to cable temperature, reach cable temperature in cable temperature When spending threshold value, power control administration equally is implemented to the PD, reduces the PD by load power consumption, thus the voltage of the PD demand Numerical value reduce, it is also ensured that cable temperature does not deteriorate further, ensure that cable functional reliability and entire base In the safety of the network of PoE.

With reference to first aspect the first is to any possible implementation in the third, the 4th of first aspect the In the possible implementation of kind, before the PSE powers to the PD, further includes:

The PSE detects the present load power consumption of the PD, according to the present load power consumption of the PD detected to institute It states PD to be classified, determines the PD rank；

According to the rank of the PD, determine that the maximum load power consumption of the PD and the PSE export most to the PD Big output voltage；

According to the maximum load power consumption of the PD, the impedance of the cable and the maximum output voltage, determination is directed to The current overload thresholding of the cable, wherein the current overload thresholding is powered control to the PD for the PSE.

Using the above method, PSE is into the power supply process of each PD, according to the impedance of each cable and each PD Maximum load power consumption, be arranged current overload thresholding, different current overload thresholdings is set for the cable with different impedances, In this way, greatly reduce PSE due to causing port to be overloaded the problem of current-unbalance in cable, and then to risk electric under PD, It ensure that the reliability of the work of PD.

Second of possible implementation with reference to first aspect, in the fifth possible implementation of the first aspect, Before the PSE sends the first ether network packet to the PD, the method also includes: the PSE determines the net The current changing rate of line, the current changing rate are used to indicate the change rate threshold value of the PD load power consumption；

It correspondingly, further include the current changing rate of the cable in the first ether network packet；

The PSE determines the current changing rate of the cable, specifically includes:

The PSE determines the corresponding maximum communication bandwidth of the cable type of the cable；

The PSE is exported according to the port speed of the PSE, the maximum communication bandwidth and the PSE to the PD Output voltage, determine the noise voltage threshold value of the cable；

In the PSE to after the PD output voltage, the PSE adjusts the output voltage according to setting time unit Voltage value, and after adjustment voltage every time, the noise voltage of the cable is measured, until the noise voltage of the cable of measurement Equal to the noise voltage threshold value；

The PSE determines that the electric current of the cable becomes in the setting time unit during last time adjusts Rate.

Using the above method, before the PSE manages the PD reduction load power consumption, the curent change of the cable is determined Rate, i.e., the change rate threshold value of the described PD load power consumption, and the current changing rate of the cable is passed through into the first Ethernet report Text is sent to the PD, makes the PD when adjusting load power consumption, and the actual rate of change of load power consumption becomes less than the load power consumption Rate threshold value ensure that link rate is equal to the rate of the PSE port, guarantee that data pass between the PSE and the PD When defeated, business packet loss phenomenon does not occur, guarantees the transmission reliability of link.

The 5th kind of possible implementation with reference to first aspect, in the 6th kind of possible implementation of first aspect In, the noise voltage threshold value meets following formula:

Wherein, U_NFor the noise voltage threshold value, U_OFor the output voltage that the PSE is exported to the PD, C is the PSE Port speed, W be the maximum communication bandwidth.

Second aspect provides a kind of power supply end equipment PSE, and the PSE, which has, realizes the above-mentioned method of supplying power to based on PoE In PSE behavior function, the function can also execute corresponding software realization by hardware realization by hardware, The hardware or software include one or more modules corresponding with above-mentioned function.

In a kind of possible implementation, the PSE includes PSE chip, processor, bus and interface, PSE chip, Processor and interface are connected with each other by bus, wherein

PSE chip, for powering to PD；

Processor, for determining the line of the cable between the PSE and PD after the PSE chip is powered to the PD Road pressure drop；

When the line drop of the cable be greater than line drop threshold value when, by the interface to the PD send first with Too network packet includes indicating that the PD reduces the instruction information of load power consumption in the first ether network packet；

Interface, for sending the first ether network packet to the PD.

In alternatively possible implementation, the PSE includes:

Power supply unit, for powering to PD；The PD connects the PSE by cable；

Processing unit, for determining the cable between the PSE and PD after said supply unit is powered to the PD Line drop；

The transmission unit, for when the line drop of the cable is greater than line drop threshold value, Xiang Suoshu PD to be sent First ether network packet includes indicating that the PD reduces the instruction information of load power consumption in the first ether network packet.

The third aspect provides a kind of power supply system based on PoE, includes PSE described in above-mentioned aspect in the system And PD, the PSE are connected by cable with the PD, and are powered for the PD；Wherein,

The PSE, for after powering to PD, determining the line drop of the cable between the PSE and the PD；When described When the line drop of cable is greater than line drop threshold value, the first ether network packet, the first ether network packet are sent to the PD In include indicate the PD reduce load power consumption instruction information；

The line drop of the PD, the cable for receiving the power supply of the PSE, and between the PSE and the PD are big When line drop threshold value, the first ether network packet that the PSE is sent is received, and according in the first ether network packet The instruction information reduces load power consumption.

Using the method for supplying power to provided by the invention based on PoE, PSE is to described in after PD output voltage, the PSE is determined The line drop of cable between PSE and the PD, it is described when the line drop of the cable is greater than line drop threshold value PSE sends the first ether network packet to the PD, includes the instruction PD reduction load power consumption in the first ether network packet Instruction information.In this way, the PSE can carry out power control administration to the PD, the PD receiving described first After ether network packet, the finger of load power consumption can be reduced according to the PD that is used to indicate for including in the first ether network packet Show information, reduce the load of itself, guarantees that voltage that the PD is received can satisfy the power supply requirement of own load, Jin Erbao Demonstrate,proving the PD can work normally.

Detailed description of the invention

Fig. 1 is a kind of power supply system schematic diagram based on PoE provided in an embodiment of the present invention；

Fig. 2 is a kind of flow chart of the method for supplying power to based on PoE provided in an embodiment of the present invention；

Fig. 3 is the output power of various cable types provided in an embodiment of the present invention and the corresponding relationship of SNR；

Fig. 4 is a kind of flow chart of the method for supplying power to based on PoE provided in an embodiment of the present invention；

Fig. 5 is a kind of structural schematic diagram of PSE provided in an embodiment of the present invention；

Fig. 6 is a kind of structural schematic diagram of PSE provided in an embodiment of the present invention.

Specific embodiment

To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts All other embodiment, shall fall within the protection scope of the present invention.

The embodiment of the present invention provides a kind of method of supplying power to and PSE based on PoE, to solve in the prior art PSE's When output voltage is fixed, since the line drop of cable between the PSE and PD is excessive, the voltage for causing the PD to receive can not expire Foot requires, and then the problem of the normal work of influence PD.Wherein, the method for the invention and controller are based on same invention structure Think, since the principle that method and device solves the problems, such as is similar, the implementation of apparatus and method can repeat place with cross-reference It repeats no more.

In the embodiment of the present invention, for PSE to after PD output voltage, the PSE determines the cable between the PSE and the PD Line drop, when the line drop of the cable be greater than line drop threshold value when, the PSE to the PD send the first ether Network packet makes the PD after receiving the first ether network packet, according to the use carried in the first ether network packet In indicating that the PD reduces the instruction information of load power consumption, the load of itself is reduced, guarantees that voltage that the PD is received can be with Meet the power supply requirement of own load, and then guarantees that the PD can work normally.

Method of supplying power to provided in an embodiment of the present invention based on PoE, suitable for the network using PoE technology.The application A kind of power supply system based on PoE is provided, the system comprises: PSE 101 and PD；For as shown in Figure 1, there are three PDs (PD 102, PD 103 and PD 104) it is connected to PSE 102.Certainly there can also be the terminal of other non-receiving end equipment (in figure not Show) it is connected to PSE 101, the application is without limitation.

The PSE 101 is the network equipment that data forwarding is realized in Ethernet, can be the ether of support PoE function Network switch, router or other network equipments, which is not limited by the present invention.

Include power-supply management system in the PSE 101, passes through the cable of standard and the PD 102, the PD respectively The 103 and PD 104 connection；Wherein, the cable of standard includes 5 class lines (CAT5), surpasses 5 class lines, 6 class lines (CAT6) etc., described Electric current is transmitted to each PD by the cable by PSE 101, provides voltage for each PD, works normally each PD, while By the cable, data interaction is carried out with each PD.

The PSE 101 can also realize the planning and management of power.The PSE 101 is to each PD output voltage Afterwards, the line drop for determining the cable between the PSE 101 and each PD, between the PSE101 and any one PD When the line drop of cable is greater than the line drop threshold value being arranged, the PSE101 indicates that the PD is reduced to PD transmission carrying and bears The the first ether network packet for carrying the instruction information of power consumption reduces the PD by load power consumption, for example, there are no data transmission to inside Or when idle functional module or business module, which closes the power supply of the module.

The PD 102, the PD 103 or the PD 104, can for IP phone, portable equipment charger, the POS, The terminal devices such as video camera receive the power supply of the PSE101, when receiving the first ether network packet that the PSE is sent, Load power consumption is reduced according to the instruction information in the first ether network packet.

As shown in fig.2, being a kind of flow chart of the method for supplying power to based on PoE provided in an embodiment of the present invention, this method Include:

After step 201:PSE powers to PD, the PSE determines the line drop of the cable between the PSE and PD.

Optionally, the PSE is when executing step 201, including following methods:

First way: the PSE detects the voltage at the both ends of the PD, and the PSE is exported to the PD defeated The difference in voltage of voltage and the both ends PD out, the line drop as the cable；

The second way: the PSE is by the product of the impedance of electric current and the cable in the cable, as the net The line drop of line；

Specifically, the PSE determines the impedance of the cable before powering to the PD；It is being powered to the PD Afterwards, the electric current in the cable is determined.

The third mode: the PSE determines the output power of the PSE, the load power consumption of the PD and the cable In electric current, by the quotient of the difference of the load power consumption of the output power of the PSE and the PD and the electric current, as the cable Line drop.

In the first way, the PSE can determine the output voltage Uo that itself is exported to the PD, and can pass through Traditional mode detects the voltage Us at the both ends PD, then the line drop U of the cable_RMeet formula one:

U_R=U_O-U_sFormula one

In the second way, the PSE to before the PD output voltage, determining the impedance R of the cable, and After output voltage, the electric current I of the cable is determined, then the line drop U of the cable_RMeet formula two:

U_R=R*I formula two

In the third mode, the PSE determines the output power P of the PSE_O, the PD load power consumption P_S, and The electric current I of the cable, then the line drop U of the cable_RMeet formula three:

In the second way, the PSE determines the impedance of the cable, comprising the following steps:

By the product of the unit length impedance and the length of the cable, as the impedance of the cable, the cable Impedance R, meet formula four:

R=r0*L formula four

Wherein, r0 is the corresponding unit length impedance of the cable type, and L is the length of the cable.

Voltage is provided to the PD since the PSE only passes through a pair of of line in cable, in above-mentioned steps, meter The impedance of obtained cable is the impedance of a pair of of line in cable, and the impedance of the cable is cable in embodiments of the present invention It is middle a pair of for providing the impedance of the line of voltage to the PD.

Traditional cable is there are many cable type, such as 5 class lines (CAT5), surpasses 5 class lines, 6 class lines (CAT6) etc., every class In be also subdivided into unshielded twisted pair (Unshielded Twisted Paired, abbreviation UTP) and Shielded Twisted Pair The cable material of (Shielded Twisted Paired, abbreviation STP), different cable types may be different, due to different nets The corresponding unit length impedance of wire rod matter is different, and therefore, every kind of cable type corresponds to unit length impedance.

Wherein, optionally, virtual cable detection can be used when determining the length of the cable in the PSE The length that (Virtual Cable Test, abbreviation VCT) function detects the cable automatically is L.

Optionally, the PSE determines the cable type of the cable, comprising:

Signal-to-noise ratio (Signal Noise Ratio, the abbreviation of PSE detection cable under multiple output powers SNR), and the output power of the cable and the first corresponding relationship of SNR are determined；

The PSE is according to the output power of various cable types and the corresponding relationship of SNR and the first corresponding pass System, determines the cable type of the cable.Wherein, the corresponding relationship of the output power and SNR of various cable types, such as Fig. 3 institute Show, wherein Fig. 3 be in the case where length of mesh wire is constant, the output power of various cable types and the corresponding relationship of SNR, Every line represents a kind of output power of cable type and the corresponding relationship of SNR, the output power of each cable type in middle figure With the corresponding relationship of SNR can also the slope of corresponding with the cable type in figure oblique line indicate, this present invention is not limited It is fixed.

Step 202: when the line drop of the cable is greater than line drop threshold value, the PSE sends the to the PD One ether network packet includes indicating that the PD reduces the instruction information of load power consumption in the first ether network packet.

The instruction information can be an indicator, or be an identifier in the first ether network packet, And the identifier is by the PSE assignment, or can also be other data for including in the first ether network packet, For notifying how the PD reduces load power consumption, such as the specified functional module of closing or business module, optionally, described first It can also include information the reason of notifying the PD to reduce load power consumption in ether network packet, that is, notify cable described in the PD Line drop is greater than the line drop threshold value.

In PoE supply standard, PSE is fixed, such as 53.5V to the output voltage of any one PD.Ordinary circumstance Under, when being less than 42.5V, the PD just can not work normally the voltage at the both ends PD.Therefore, between the PSE and the PD The line drop of cable should be less than the difference of the fixed value and 42.5V.For example, working as output voltage of the PSE to the PD When for 53.5V, in step 202, it is 11V that line drop threshold value, which can be set,.

Through the above steps, when the line drop of the cable between the PSE and the PD is greater than line drop threshold value, The PSE carries out power control administration to the PD, i.e., the described PSE, which sends to carry to the PD, is used to indicate PD reduction load First ether network packet of the instruction information of power consumption, make the PD reduce load power consumption, for example, to inside there are no data transmit or When idle functional module or business module, the PD closes the power supply of the module.In this way, the PD reduces own load, The numerical value of the voltage of demand reduces, and the voltage for providing PSE to the PD can satisfy the power supply requirement of the PD, described in guarantee PD is worked normally, and power-down conditions do not occur.

Optionally, the method also includes:

When the PSE determine the cable temperature be greater than cable temperature threshold when, the PSE to the PD send second with Too network packet includes indicating that the PD reduces the instruction information of load power consumption in the second ether network packet.The cable temperature Spending threshold value can be arranged according to the requirement that local environment or network are disposed, for example, being 60 degrees Celsius.

Wherein, the cable Insertion Loss of the cable, meets formula five:

Wherein, IL is the cable Insertion Loss of the cable, u_OFor first voltage pulse, u_SFor second voltage pulse, wherein u_O、 u_STime Domain Reflectometry (the Time Domain of the physical layer (Physical Layer, abbreviation PHY) of the PSE can be passed through Reflectometry, abbreviation TDR) technology determination.

The corresponding relationship of cable Insertion Loss and cable temperature meets formula six:

Wherein T is the temperature of cable, and k is the temperature varying coefficient of cable, and f is the PSE port bandwidth frequency.In formula In six, the PSE can obtain f by PHY auto-negotiation, and in the initial temperature T0 of the known cable, the PD is initial When powering on, the cable Insertion Loss IL0 of the cable；The PSE can determine the cable according to f, T0, IL0 and formula six Temperature varying coefficient k.In turn, after the cable Insertion Loss and k, f for determining the cable, institute can be determined by formula six State cable temperature.

Optionally, the second ether network packet can be able to be identical Ethernet report with the first ether network packet Text or different ether network packets.Optionally, the second ether network packet, which also may include, notifies the PD to reduce load The reason of power consumption information, that is, notify cable temperature described in the PD be greater than cable temperature threshold.Obviously, when first Ethernet When in message or the second ether network packet including information the reason of notifying the PD to reduce load power consumption, first ether Network packet is different with the second ether network packet.Optionally, when the PSE determines that the line drop is greater than line drop threshold When being worth and determining that the cable temperature is greater than cable temperature threshold, the PSE can send the first ether network packet simultaneously With the second ether network packet, or directly transmit among the two wherein any one, alternatively, by first Ethernet Message and the second ether network packet are combined into an ether network packet and send, and which is not limited by the present invention.

Cable when the temperature is excessively high, easily cause that route is unstable, the performance decline of cable, regulation cable is maximum in standard Operating temperature be 60 degrees Celsius, the PSE by cable to the PD provide voltage when, due to the PD load it is larger or Electric current is higher in cable, and the cable is easy to generate heat, however, there is no the temperature to cable in traditional network based on PoE Degree real time monitoring, therefore, the functional reliability of cable reduce, and there are security risks for the network.

Using aforesaid way, the PSE monitors cable temperature in real time, and reaches the cable temperature of setting in cable temperature When threshold value, the PSE also carries out power control administration to the PD, i.e., the described PSE is carried to PD transmission and indicated the PD Reduce load power consumption instruction information the second ether network packet, make the PD reduction load power consumption, for example, to the inside PD without Data transmission or idle functional module or business module, the PD close the power supply of the module, to reduce load power consumption.This The voltage of sample, the PD demand can reduce, it is also ensured that cable temperature does not deteriorate further, ensure that the work of cable can By the safety of property and whole network.

Optionally, the method also includes in the PSE to before the PD output voltage, further includes:

The PSE detects the present load power consumption of the PD, is determined according to the present load power consumption of the PD detected The PD is classified, and determines the rank of the PD；

For example, the PSE is to after the PD output voltage, the PSE determines the electric current of the cable, when the cable When electric current is greater than or equal to the current overload thresholding, the PSE carries out lower electric treatment to the PD.

In traditional each PoE supply standard, according to the load power consumption of the PD of connection, PD is classified, for every The parameters such as the output power of corresponding PSE and the maximum load power consumption of PD, output voltage range are arranged in a rank.

Wherein, according to the impedance of the maximum load power consumption of the PD and the cable and the PSE to the PD The output voltage of output determines the current overload thresholding for being directed to the cable, comprising:

The PSE is according to the maximum load power consumption of the PD and the impedance of the cable and the PSE to described The output voltage of PD output, can be determining in the case where the load power consumption of the PD is maximum load power consumption by formula seven, The voltage at the both ends PD:

Wherein, P_SmaxFor the maximum load power consumption of the PD, U_OmaxTo be maximum load power consumption in the load power consumption of the PD In the case where, the maximum output voltage that the PSE is exported to the PD, R is the impedance of the cable, U_SIn the load of the PD In the case that power consumption is maximum load power consumption, the voltage at the both ends PD；

The PSE according to the voltage at the both ends PD in the case where the load power consumption of the PD is maximum load power consumption, And the maximum load power consumption of the PD determines that the load power consumption in the PD is the feelings of maximum load power consumption according to formula eight Under condition, the electric current of the cable:

The PSE according to the load power consumption of the PD be maximum load power consumption in the case where, the electric current of the cable I_max, determine the current overload thresholding I of the cable_cut, wherein I_cut> I_max。

In traditional network based on PoE, after PSE is classified PD according to the bearing power of PD, PSE and each PD Between the current overload thresholding of cable be same setting, in this way, PSE cannot consider line loss and in high-power confession In the case where electricity, in cable between current-unbalance the problem of, cause PSE to the PD voltage provided be unable to satisfy PD load need It asks, in the presence of the PD a possibility that electricity.

Using aforesaid way, PSE is into the power supply process of each PD, according to the impedance of each cable and each PD Maximum load power consumption, be arranged current overload thresholding, different current overload thresholdings is set for the cable with different impedances, In this way, greatly reduce PSE due to causing port to be overloaded the problem of current-unbalance in cable, and then to risk electric under PD, It ensure that the reliability of the work of PD.

Optionally, in the above-described embodiments, before the PSE sends the first ether network packet to the PD, institute State method further include: the PSE determines that the current changing rate of the cable, the current changing rate are used to indicate the PD load The change rate threshold value of power；Correspondingly, the PSE is sent in the first ether network packet to the PD in step 202, also Current changing rate including the cable.Optionally, the PSE can also into the second ether network packet that the PD is sent To include the current changing rate of the cable.

Optionally, the PSE determines the current changing rate of the cable, specifically includes:

Wherein, current changing rate is the change rate threshold value within the unit time of the PD load power consumption.

After step 202, the PD, which receives to carry, is used to indicate the first of the instruction information that the PD reduces load power consumption After ether network packet, the PD reduces own load power consumption according to the instruction information, however, the load as the PD becomes When change, the noise of the chain road between the PSE and the PD corresponding can also change, and reduce so as to cause signal-to-noise ratio, according to Signal-to-noise ratio reduces known to shannon formula (formula nine), then the link rate can also reduce, and when the PD reduces itself During load power consumption, the change rate of load power consumption within the unit time of the PD is excessive, may result in the link Rate is less than the rate of the PSE port, and then there is a phenomenon where business packet losses, influence the work between the PSE and the PD Make efficiency.Therefore, during the PD reduces the load of itself, need to guarantee the variation of the load power consumption within the unit time Rate is not in the range of business packet loss occurs for link.

Wherein, C is the link rate, and W is the corresponding maximum communication bandwidth of cable type of the cable, and S is average Signal power, N are average noise power.

SNR can be indicated by formula ten or formula 11:

Wherein, U_OFor the output voltage that the PSE is exported to the PD, U_NThe noise voltage of the cable；

Therefore, according to formula ten and formula 11, available formula 12:

When the port speed for guaranteeing the PSE is equal to the link rate, according to formula 12 and formula nine, can obtain To the noise voltage threshold value, meet following formula 13:

The PSE detect the cable noise voltage be equal to the noise voltage threshold value when, obtain setting when Between current changing rate in unit, the change rate of the PD adjustment load power consumption as in setting time unit.Therefore, the PD Only when guaranteeing to adjust load power consumption, the change rate of load power consumption is less than the current changing rate, Cai Nengbao in the unit time The rate that the link rate is equal to the PSE port is demonstrate,proved not send out when guaranteeing that data are transmitted between the PSE and the PD Occupation business packet loss phenomenon, guarantees the transmission reliability of link.

Using the method for supplying power to based on PoE in the above embodiment of the present invention, the route pressure of the cable between PSE and PD When drop is greater than line drop threshold value, the PSE carries out power control administration to the PD, reduces the PD by load power consumption, in this way, The PD reduces own load, and the numerical value of the voltage of demand reduces, and the voltage for providing PSE to the PD can satisfy described The power supply requirement of PD guarantees that the PD is worked normally, power-down conditions does not occur；

The PSE can also carry out implementing monitoring to cable temperature, when cable temperature reaches cable temperature threshold, equally Power control administration is implemented to the PD, reduces the PD by load power consumption, so that the numerical value of the voltage of the PD demand reduces, It can guarantee that cable temperature does not deteriorate further, ensure that the functional reliability of cable, and the entirely network based on PoE Safety；

PSE is into the power supply process of each PD, according to the impedance of each cable and the maximum load function of each PD Consumption is arranged current overload thresholding, different current overload thresholdings is arranged for the cable with different impedances, in this way, subtracting significantly Lack PSE due to causing port to be overloaded the problem of current-unbalance in cable, and then to risk electric under PD, ensure that the work of PD The reliability of work；

Before the PSE manages the PD reduction load power consumption, determines the change rate threshold value of the PD load power consumption, make institute PD is stated when adjusting load power consumption, the actual rate of change of load power consumption is less than the load power consumption change rate threshold value, ensure that link Rate is equal to the rate of the PSE port, and when guaranteeing that data are transmitted between the PSE and the PD, business packet loss does not occur Phenomenon guarantees the transmission reliability of link.

Based on above embodiments, the present invention also provides a kind of method of supplying power to based on PoE, as shown in fig.4, the side The process of method includes:

Step 401: the PSE determines the impedance of the cable.

Wherein, optionally, the PSE determines the impedance of the cable, comprising the following steps:

Impedance by the product of the unit length impedance and the length of the cable, as the cable.

Wherein, optionally, the PSE is when determining the length of the cable, can be used described in VCT function detects automatically The length of cable is L.

Optionally, the PSE determines the cable type of the cable, comprising:

The SNR of PSE detection cable under multiple output powers, and determine the output power of the cable with The first corresponding relationship of SNR；

The PSE is according to the output power of various cable types and the corresponding relationship of SNR and the first corresponding pass System, determines the cable type of the cable.Wherein, the corresponding relationship of the output power and SNR of various cable types, such as Fig. 3 institute Show.

Step 402: the PSE is classified the PD, determines the corresponding rank of the PD, corresponding according to the PD Rank determines the maximum output voltage that the maximum load power consumption of the PD and the PSE are exported to the PD.

Wherein, the PSE is classified the PD, is the present load power consumption by detecting the PD, according to described What the present load power consumption of PD determined.

According to the rank of the PD, the output power of the corresponding PSE of the rank and the maximum load function of PD can be determined The parameters such as consumption, output voltage range.

Step 403: according to the maximum load power consumption of the PD, the impedance of the cable and the maximum output voltage, Determine the current overload thresholding for being directed to the cable.

Optionally, the PSE is according to the maximum load power consumption of the PD and the impedance of the cable and the PSE The output voltage exported to the PD can determine that in the load power consumption of the PD be maximum load power consumption by formula seven In the case of, the voltage at the both ends PD；

The PSE according to the voltage at the both ends PD in the case where the load power consumption of the PD is maximum load power consumption, And the maximum load power consumption of the PD determines that the load power consumption in the PD is the feelings of maximum load power consumption according to formula eight Under condition, the electric current of the cable；

In this way, PSE is born into the power supply process of each PD according to the maximum of the impedance of each cable and each PD Power consumption is carried, current overload thresholding is set, different current overload thresholdings is set for the cable with different impedances, in this way, greatly Reduce PSE due to causing port to be overloaded the problem of current-unbalance in cable, and then to risk electric under PD greatly, ensure that PD Work reliability.

Step 404: the PSE is powered on to the PD, Xiang Suoshu PD output voltage, wherein the electric current of the cable is less than The current overload thresholding.

Step 405: the PSE determines that the PSE determines the line drop of the cable.

Wherein, when executing step 405, following methods are specifically included:

The second way: the PSE determines the impedance of the cable to before the PD output voltage；And to After the PD output voltage, the electric current in the cable is determined；By the impedance of electric current and the cable in the cable Product, the line drop as the cable；

Step 406: the PSE judges whether the line drop is greater than line drop threshold value, if so, executing reduces institute State the process of PD load power consumption；Otherwise, step 405 is continued to execute.

Step 407- step 408 is to reduce the process of the PD load power consumption.Optionally, the execution time of step 407 is Any time after step 404, which is not limited by the present invention, is only a kind of executive mode in figure.

Step 407: the PSE determines that the link-speeds between the PSE and the PD are equal to the PSE port rate When, the current changing rate of the cable in setting time unit.

Optionally, the PSE is when executing step 407, comprising the following steps:

The PSE determines that the electric current of the cable becomes in the setting time unit during last time adjusts Rate.Wherein, current changing rate is the change rate threshold value within the unit time of the PD load power consumption.

Step 408: the PSE generates the first ether network packet, and sends the first ether network packet to the PD, Described in include in the first ether network packet indicate the PD reduce load power consumption instruction information and the curent change Rate.

The instruction information can be an indicator, or be an identifier in the first ether network packet, And the identifier is by PSE assignment, or can also be other data for including in the first ether network packet, is used for It notifies how the PD reduces load power consumption, such as closes specified functional module or business module, optionally, first ether It can also include information the reason of notifying the PD to reduce load power consumption in network packet, that is, notify the route of cable described in the PD Pressure drop is greater than the line drop threshold value.

After step 408, the PD receives the first ether network packet that the PSE is sent, according to finger therein Show information, the load power consumption of itself is adjusted, and guarantees that the change rate of the load power consumption within the unit time is less than the electricity Rheology rate.

Step 409: the PSE determines the cable temperature.

The PSE is when executing step 409, comprising the following steps:

When the PSE determine the cable temperature be greater than cable temperature threshold when, the PSE to the PD send second with Too network packet includes being used to indicate the PD to reduce the instruction information of load power consumption in the second ether network packet.The net Line temperature threshold can be arranged according to the requirement that local environment or network are disposed, and for example, 60 degrees Celsius.

Step 410: the PSE judges whether the cable temperature is greater than cable temperature threshold, if so, executing reduces institute State the process of PD load power consumption；Otherwise, step 409 is continued to execute.

Step 411- step 412 is to reduce the process of the PD load power consumption.Optionally, the execution time of step 411 is Any time after step 404, which is not limited by the present invention, is only a kind of executive mode in figure.

Step 411: the PSE determines that the link-speeds between the PSE and the PD are equal to the PSE port rate When, the current changing rate of the cable in setting time unit.The step is with step 407, and details are not described herein again, specific In practical scene, the current changing rate of the cable only can be calculated once, and the PSE is stored after determining, rear It, can be directly by the curent change of the cable of storage when phase needs to send the first ether network packet or the second ether network packet Rate carries in the first ether network packet or the second ether network packet.

Step 412: the PSE generates the second ether network packet, and sends the second ether network packet to the PD, In, it include the instruction information for indicating the PD reduction load power consumption and the curent change in the second ether network packet Rate.

After step 412, the PD receives the second ether network packet that the PSE is sent, and is believed according to instruction therein Breath, is adjusted the load power consumption of itself, and guarantees that the change rate of the load power consumption within the unit time becomes less than the electric current Rate.

The method of supplying power to based on PoE provided using the above embodiment of the present invention, the route of the cable between PSE and PD When pressure drop is greater than line drop threshold value, the PSE carries out power control administration to the PD, reduces the PD by load power consumption, this Sample, the PD reduce own load, and the numerical value of the voltage of demand reduces, and the voltage for providing PSE to the PD can satisfy The power supply requirement of the PD guarantees that the PD is worked normally, power-down conditions does not occur；

Also, the PSE can also carry out implementing monitoring to cable temperature, reach cable temperature threshold in cable temperature When, power control administration equally is implemented to the PD, reduces the PD by load power consumption, thus the numerical value of the voltage of the PD demand It reduces, it is also ensured that cable temperature does not deteriorate further, ensure that the functional reliability of cable, and is entirely based on PoE Network safety；

The present invention also provides a kind of PSE, for realizing PSE in the method for supplying power to as shown in Figure 2 and Figure 4 based on PoE Function, as shown in fig.5, include: power supply unit 501, processing unit 502 and transmission unit 503 in the PSE 500, Wherein,

Power supply unit 501, for powering to PD；The PD connects the PSE 500 by cable；

Processing unit 502, for said supply unit 501 to the PD power supply after, determine the PSE500 with it is described The line drop of cable between PD；

The transmission unit 503, for when the line drop of the cable is greater than line drop threshold value, Xiang Suoshu PD to be sent out The first ether network packet is sent, includes indicating that the PD reduces the instruction information of load power consumption in the first ether network packet.

Optionally, the PSE 500 further includes the first determination unit 504, in said supply unit 501 to the PD After power supply, the electric current in the cable is determined；

The processing unit 502 is specifically used for when determining the line drop of the cable:

Before said supply unit 501 is powered to the PD, the impedance of the cable is determined；

Line drop by the product of the impedance of electric current and the cable in the cable, as the cable.

Optionally, the processing unit 502 is specifically used for when determining the impedance of the cable: determining the cable Cable type；The corresponding unit length impedance of the cable type is determined according to the cable type；And by the unit length The product of the length of impedance and the cable, the impedance as the cable.

The PSE 500 further includes the second determination unit 505, for determining the length of the cable；

The processing unit 502 is specifically used in the cable type for determining the cable:

According to the SNR of the cable described under multiple output powers, determine the cable output power and first pair of SNR It should be related to；According to the corresponding relationship and first corresponding relationship of the output power of various cable types and SNR, institute is determined State the cable type of cable；

The PSE 500 further includes SNR detection unit 506, described under the multiple output power for detecting and obtaining The SNR of cable.

Optionally, the PSE 500 further includes pulse detecting unit 507；The pulse detecting unit 507 is used for institute It states PD and sends first voltage pulse, and detect the second voltage pulse that the PD is received；

The processing unit 502 is also used to according to the first voltage pulse and the second voltage pulse, really The cable Insertion Loss of the fixed cable；And according to the corresponding relationship of Insertion Loss and temperature, determine that the cable Insertion Loss of the cable is corresponding Cable temperature；

The transmission unit 503 is also used to when determining that the cable temperature is greater than the cable temperature threshold of setting, to institute It states PD and sends the second ether network packet, include being used to indicate the PD to reduce the finger of load power consumption in the second ether network packet Show information.

Optionally, the PSE 500 further includes consumption detection unit 508, for detecting the present load power consumption of the PD； Specifically, the consumption detection unit 508 detects the current of the PD before said supply unit 501 is powered to the PD Load power consumption.

The processing unit 502, the present load for the PD for being also used to be detected according to the consumption detection unit 508 Power consumption is classified the PD, determines the rank of the PD；According to the rank of the PD, the maximum load function of the PD is determined Consumption, and the maximum output voltage exported to the PD；According to the impedance of the maximum load power consumption, the cable of the PD, with And the maximum output voltage, determine the current overload thresholding for being directed to the cable, wherein the current overload thresholding is used for institute It states PSE and control is powered to the PD.

Optionally, the processing unit 502 is also used to determine that the current changing rate of the cable, the current changing rate are used In the change rate threshold value for indicating the PD load power consumption；Specifically, the processing unit 502 is in the transmission unit 503 to institute Before stating PD transmission the first ether network packet, the current changing rate of the cable is determined.

The processing unit 502 is specifically used for when determining the current changing rate of the cable:

Determine the corresponding maximum communication bandwidth of the cable type of the cable；

According to the port speed of the PSE 500, the maximum communication bandwidth and said supply unit 501 to described The output voltage of PD output, determines the noise voltage threshold value of the cable；

Said supply unit 501 is also used to adjust according to setting time unit described defeated to after the PD output voltage The voltage value of voltage out, until the noise voltage of the cable of measurement is equal to the noise voltage threshold value；The PSE 500 is also Including noise voltage measuring unit 509, for measuring making an uproar for the cable after said supply unit 501 every time adjustment voltage Psophometric voltage；

The processing unit 502 is determining during last time adjusts, the cable in the setting time unit Current changing rate.

Optionally, the noise voltage threshold value meets following formula:

Wherein, U_NFor the noise voltage threshold value, U_OFor the output voltage that said supply unit 501 is exported to the PD, C For the port speed of the PSE 500, W is the maximum communication bandwidth.

Using PSE provided in an embodiment of the present invention, the line drop of the cable between PSE and PD is greater than line drop threshold When value, the PSE carries out power control administration to the PD, reduces the PD by load power consumption, in this way, the PD reduces itself The numerical value of load, the voltage of demand reduces, and the voltage for providing PSE to the PD can satisfy the power supply requirement of the PD, protects It demonstrate,proves the PD to work normally, power-down conditions does not occur；

The PSE can also carry out implementing monitoring to cable temperature, when cable temperature sets cable temperature threshold, equally Power control administration is implemented to the PD, reduces the PD by load power consumption, so that the numerical value of the voltage of the PD demand reduces, It can guarantee that cable temperature does not deteriorate further, ensure that the functional reliability of cable, and the entirely network based on PoE Safety；

The PSE is into the power supply process of each PD, according to the impedance of each cable and the maximum load of each PD Power consumption is arranged current overload thresholding, different current overload thresholdings is arranged for the cable with different impedances, in this way, significantly Reduce PSE due to causing port to be overloaded the problem of current-unbalance in cable, and then to risk electric under PD, ensure that PD's The reliability of work；

It should be noted that being schematical, only a kind of logic function to the division of unit in the embodiment of the present invention It divides, there may be another division manner in actual implementation.Each functional unit in embodiments herein can integrate In one processing unit, it is also possible to each unit and physically exists alone, one can also be integrated in two or more units In a unit.Above-mentioned integrated unit both can take the form of hardware realization, can also be in the form of software functional units It realizes.

If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product When, it can store in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words It embodies, which is stored in a storage medium, including some instructions are used so that a computer It is each that equipment (can be personal computer, server or the network equipment etc.) or processor (processor) execute the application The all or part of the steps of embodiment the method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, abbreviation ROM), random access memory (Random Access Memory, abbreviation RAM), magnetic disk Or the various media that can store program code such as CD.

The present invention also provides a kind of PSE, for realizing PSE in the method for supplying power to as shown in Figure 2 and Figure 4 based on PoE Function, as shown in fig.6, include: PSE chip 601, processor 602, bus 603 and interface 604 in the PSE 600, Wherein,

PSE chip 601, processor 602 and interface 604 are connected with each other by bus 603；Bus 803 can be peripheral hardware Component connection standard (peripheral component interconnect, abbreviation PCI) bus or expanding the industrial standard structure (extended industry standard architecture, abbreviation EISA) bus etc..The bus can be divided into address Bus, data/address bus, control bus etc..Only to be indicated with a thick line in Fig. 6, it is not intended that only one convenient for indicating Bus or a type of bus.

PD is connected to interface 604 by cable.The PSE 600 is communicated by the interface 604 with the PD, Xiang Suoshu PD provides electric power.

PSE chip 601, for powering to the PD；

Processor 602, for determining between the PSE 600 and PD after the PSE chip 601 is powered to the PD Cable line drop；

When the line drop of the cable be greater than line drop threshold value when, by interface 604 to the PD send first with Too network packet includes indicating that the PD reduces the instruction information of load power consumption in the first ether network packet.

Optionally, the PSE chip 601 is also used to after powering to the PD, determines the electric current in the cable；

The processor 602 is specifically used for when determining the line drop of the cable:

Before the PSE chip 601 is powered to the PD, the impedance of the cable is determined；

Optionally, the processor 602 is specifically used for when determining the impedance of the cable: determining the net of the cable Line type；The corresponding unit length impedance of the cable type is determined according to the cable type；And the unit length is hindered The product of anti-and the cable length, the impedance as the cable；

The PSE chip 601, is also used to determine the length of the cable；

The processor 602 is specifically used in the cable type for determining the cable:

According to the SNR of the cable described under multiple output powers, the output power and Signal to Noise Ratio (SNR) of the cable are determined First corresponding relationship；According to the corresponding relationship and first corresponding relationship of the output power of various cable types and SNR, Determine the cable type of the cable；

The PSE chip 601, is also used to detect and obtain the SNR of the cable under the multiple output power.

Optionally, the PSE chip 601 is also used to send first voltage pulse to the PD, and detects the PD and receive The second voltage pulse arrived；

The processor 602 is also used to according to the first voltage pulse and the second voltage pulse, determine described in The cable Insertion Loss of cable；And according to the corresponding relationship of Insertion Loss and temperature, the corresponding cable temperature of the cable Insertion Loss of the cable is determined Degree；When determine the cable temperature be greater than cable temperature threshold when, Xiang Suoshu PD send the second ether network packet, described second with It include indicating that the PD reduces the instruction information of load power consumption too in network packet.

Optionally, the PSE chip 601 is also used to before the PSE chip 601 is powered to the PD, described in detection The present load power consumption of PD；

The processor 602, the present load power consumption pair for the PD for being also used to be detected according to the PSE chip 601 The PD is classified, and determines the rank of the PD；According to the rank of the PD, the maximum load power consumption of the PD is determined, with And the maximum output voltage that the PSE chip 601 is exported to the PD；According to the maximum load power consumption of the PD, the cable Impedance and the maximum output voltage, determine be directed to the cable current overload thresholding, wherein the current overload Thresholding is powered control to the PD for the PSE 600.

Optionally, the processor 602 is also used to before sending the first ether network packet to the PD, determines institute State current changing rate；The current changing rate is used to indicate the change rate threshold value of the PD load power consumption；

The processor 602 is specifically used for:

According to the port speed of the PSE 600, the maximum communication bandwidth and the PSE chip 601 to the PD The output voltage of output determines the noise voltage threshold value of the cable；

The PSE chip 601 is also used to adjust the output according to setting time unit to after the PD output voltage The voltage value of voltage, and after adjustment voltage every time, the noise voltage of the cable is measured, until the cable of measurement is made an uproar Psophometric voltage is equal to the noise voltage threshold value；

The processor 602 is determining during last time adjusts, the cable in the setting time unit Current changing rate.

Optionally, the noise voltage threshold value meets following formula:

Wherein, U_NFor the noise voltage threshold value, U_OFor the output voltage that the PSE chip 601 is exported to the PD, C is The port speed of the PSE, W are the maximum communication bandwidth.

The PSE 600 can also include memory, for storing program etc..Specifically, program may include program code, The program code includes computer operation instruction.Memory may include random access memory (random access Memory, abbreviation RAM), it is also possible to it further include nonvolatile memory (non-volatile memory), for example, at least one Magnetic disk storage.Processor 602 executes the application program that memory is stored, and realizes above-mentioned function, to realize such as Fig. 2 and figure Based on the method for supplying power to of PoE shown in 4.

In conclusion the method for supplying power to and PSE provided in an embodiment of the present invention based on PoE, the cable between PSE and PD Line drop be greater than line drop threshold value when, the PSE to the PD carry out power control administration, make the PD reduce load function Consumption, in this way, the PD reduces own load, the numerical value of the voltage of demand is reduced, and the voltage for providing PSE to the PD can be with The power supply requirement for meeting the PD guarantees that the PD is worked normally, power-down conditions does not occur；The PSE can also be to cable temperature Degree carries out implementing monitoring, when cable temperature reaches cable temperature threshold, equally implements power control administration to the PD, makes this PD reduces load power consumption, so that the numerical value of the voltage of the PD demand reduces, it is also ensured that cable temperature is not disliked further Change, ensure that the functional reliability of cable, and the entirely safety of the network based on PoE；PSE is in the power supply to each PD Current overload thresholding is arranged according to the impedance of each cable and the maximum load power consumption of each PD in Cheng Zhong, for not Different current overload thresholdings is arranged in cable with impedance, in this way, greatly reduce PSE due in cable current-unbalance ask Topic causes port to be overloaded, and then to risk electric under PD, ensure that the reliability of the work of PD；The PSE manages the PD drop Before low-load power consumption, the change rate threshold value of the PD load power consumption is determined, make the PD when adjusting load power consumption, load function The actual rate of change of consumption is less than the load power consumption change rate threshold value, ensure that link rate is equal to the rate of the PSE port, protects Card when data transmission, business packet loss phenomenon does not occur, guarantees the transmission reliability of link between the PSE and the PD.

It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more, The computer journey implemented on non-volatile memory medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) The form of sequence product.

The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.

These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.

Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as It selects embodiment and falls into all change and modification of the scope of the invention.

Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention The range of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention and its wait Within the scope of technology, then the present invention is also intended to include these modifications and variations.

Claims

1. a kind of method of supplying power to based on Power over Ethernet PoE characterized by comprising

After the end equipment PSE that powers powers to receiving end equipment PD, the PSE determines the route of the cable between the PSE and PD Pressure drop；

When the line drop of the cable is greater than line drop threshold value, the PSE sends the first ether network packet to the PD, It include indicating that the PD reduces the instruction information of load power consumption in the first ether network packet.

2. the method as described in claim 1, which is characterized in that the PSE determines the line drop of the cable, comprising:

The PSE determines the impedance of the cable before powering to the PD；

The PSE determines the electric current in the cable after powering to the PD；And

3. method according to claim 2, which is characterized in that the PSE determines the impedance of the cable, comprising:

Wherein, the PSE determines the cable type of the cable, comprising:

The Signal to Noise Ratio (SNR) of PSE detection cable under multiple output powers, and determine the output power of the cable with The first corresponding relationship of SNR；

The PSE is according to the output power of various cable types and the corresponding relationship of SNR and first corresponding relationship, really The cable type of the fixed cable.

4. the method according to claim 1, which is characterized in that the method also includes:

The PSE determines the cable Insertion Loss of the cable according to the first voltage pulse and the second voltage pulse；

When the PSE determines that the cable temperature is greater than cable temperature threshold, the PSE sends the second Ethernet to the PD Message includes indicating that the PD reduces the instruction information of load power consumption in the second ether network packet.

5. method as claimed in claim 2 or claim 3, which is characterized in that before the PSE powers to the PD, further includes:

The PSE detects the present load power consumption of the PD, according to the present load power consumption of the PD detected to the PD It is classified, determines the rank of the PD；

According to the rank of the PD, the maximum for determining that the maximum load power consumption of the PD and the PSE are exported to the PD is defeated Voltage out；

According to the maximum load power consumption of the PD, the impedance of the cable and the maximum output voltage, determine for described The current overload thresholding of cable, wherein the current overload thresholding is powered control to the PD for the PSE.

6. method as claimed in claim 3, which is characterized in that send the first Ethernet report to the PD in the PSE Before text, the method also includes: the PSE determines that the current changing rate of the cable, the current changing rate are used to indicate The change rate threshold value of the PD load power consumption；

The PSE exports according to the port speed of the PSE, the maximum communication bandwidth and the PSE to the PD defeated Voltage out determines the noise voltage threshold value of the cable；

In the PSE to after the PD output voltage, the PSE adjusts the voltage of the output voltage according to setting time unit Value, and after adjustment voltage every time, the noise voltage of the cable is measured, until the noise voltage of the cable of measurement is equal to The noise voltage threshold value；

The PSE is determining during last time adjusts, the current changing rate of the cable in the setting time unit.

7. method as claimed in claim 6, which is characterized in that the noise voltage threshold value meets following formula:

Wherein, U_NFor the noise voltage threshold value, U_OFor the output voltage that the PSE is exported to the PD, C is the end of the PSE Mouth rate, W are the maximum communication bandwidth.

8. a kind of power supply end equipment PSE characterized by comprising

PSE chip, for powering to receiving end equipment PD；

Processor, for determining the route pressure of the cable between the PSE and PD after the PSE chip is powered to the PD Drop；

When the line drop of the cable is greater than line drop threshold value, Xiang Suoshu PD sends the first ether network packet, and described the It include indicating that the PD reduces the instruction information of load power consumption in one ether network packet.

9. PSE as claimed in claim 8, which is characterized in that the PSE chip is also used to after powering to the PD, really Electric current in the fixed cable；

The processor is specifically used for when determining the line drop of the cable:

Before the PSE chip is powered to the PD, the impedance of the cable is determined；

10. PSE as claimed in claim 9, which is characterized in that

The processor is specifically used for when determining the impedance of the cable: determining the cable type of the cable；According to institute It states cable type and determines the corresponding unit length impedance of the cable type；And by the unit length impedance and the cable The product of length, the impedance as the cable；

The PSE chip, is also used to determine the length of the cable；

The processor is specifically used in the cable type for determining the cable:

According to the Signal to Noise Ratio (SNR) of the cable described under multiple output powers, determine the cable output power and SNR first Corresponding relationship；According to the corresponding relationship and first corresponding relationship of the output power of various cable types and SNR, determine The cable type of the cable；

The PSE chip, is also used to detect and obtain the SNR of the cable under the multiple output power.

11. such as the described in any item PSE of claim 8-10, which is characterized in that

The PSE chip is also used to send first voltage pulse to the PD, and detects the second voltage arteries and veins that the PD is received Punching；

The processor is also used to determine the net of the cable according to the first voltage pulse and the second voltage pulse Line Insertion Loss；And according to the corresponding relationship of Insertion Loss and temperature, the corresponding cable temperature of the cable Insertion Loss of the cable is determined；Work as determination When the cable temperature is greater than cable temperature threshold, Xiang Suoshu PD sends the second ether network packet, the second ether network packet In include indicating that the PD reduces the instruction information of load power consumption.

12. the PSE as described in claim 9 or 10, which is characterized in that the PSE chip is also used in the PSE chip to institute Before stating PD power supply, the present load power consumption of the PD is detected；

The present load power consumption of the processor, the PD for being also used to be detected according to the PSE chip carries out the PD Classification, determines the rank of the PD；According to the rank of the PD, determine the PD maximum load power consumption and the PSE core The maximum output voltage that piece is exported to the PD；According to the maximum load power consumption of the PD, the impedance of the cable and described Maximum output voltage determines the current overload thresholding for being directed to the cable, wherein the current overload thresholding is used for the PSE Control is powered to the PD.

13. PSE as claimed in claim 10, which is characterized in that the processor is also used to sending described the to the PD Before one ether network packet, the current changing rate is determined；The current changing rate is used to indicate the change of the PD load power consumption Rate threshold value；

The processor is specifically used for:

The output exported according to the port speed of the PSE, the maximum communication bandwidth and the PSE chip to the PD Voltage determines the noise voltage threshold value of the cable；

The PSE chip is also used to adjust the output voltage according to setting time unit to after the PD output voltage Voltage value, and after adjustment voltage every time, the noise voltage of the cable is measured, until the noise voltage of the cable of measurement Equal to the noise voltage threshold value；

The processor is determining during last time adjusts, the curent change of the cable in the setting time unit Rate.

14. PSE as claimed in claim 13, which is characterized in that the noise voltage threshold value meets following formula:

Wherein, U_NFor the noise voltage threshold value, U_OFor the output voltage that the PSE chip is exported to the PD, C is the PSE Port speed, W be the maximum communication bandwidth.